lib/rubocop/cop/rspec/verified_doubles.rb in rubocop-rspec-1.3.1 vs lib/rubocop/cop/rspec/verified_doubles.rb in rubocop-rspec-1.4.0

@@ -1,6 +1,7 @@
 # encoding: utf-8
+# frozen_string_literal: true
 
 module RuboCop
   module Cop
     module RSpec
       # Prefer using verifying doubles over normal doubles.
@@ -15,10 +16,10 @@
       #   # good
       #   it '...' do
       #     widget = instance_double("Widget")
       #   end
       class VerifiedDoubles < Cop
-        MSG = 'Prefer using verifying doubles over normal doubles.'
+        MSG = 'Prefer using verifying doubles over normal doubles.'.freeze
 
         def on_send(node)
           _receiver, method_name, *_args = *node
           return unless method_name == :double
           add_offense(node,